Polio in London: From the vaccine to the symptoms, what you need to know about the virus

Traces of the polio virus capable of causing the disease of the same name have been found in the sewer system in the city of London. What can the presence of the virus mean?

The Covid19 epidemic has taught us the importance of monitoring infectious diseases which can be direct, by mass testing to the population or by tracing the chains of contagion, or it can be indirect like the analysis of wastewater.